@ Ella, I will give you my opinion about some of these features now that I've spent some hours playing with this thing...
The FX sound great, and you have control over many parameters of each (also assignable to the 2 control knobs, although the knobs tend to skip around which can be annoying, especially when trying to automate during resampling). The delays I find especially nice, they give a 3-dimensional atmosphere to mono sounds, very refreshing after using chorus for this purpose with the 404 with mixed results. I found that randomly hitting the tap tempo button while resampling makes some trippy glitches.
I haven't messed with the time stretch much, but it is noticeably better than the 404. Also, tempo stays consistent regardless of in pattern mode or sampling mode, so FX will always sync to present tempo (no need to make dummy patterns). Unfortunately, any time-stretched sample will hog twice its polyphony space.
I like the sequencer because you can go into 'practice mode' by toggling rec button. Annoying metronome is at a fixed, harsh loudness but it can be turned off (99 bars method). Also patterns can apparently be switched on the fly by closest bar instead of end pattern. Best of all, you can resample pattern performance to a key, re-chop, etc.
Different sampling modes are nice...but as said earlier on this thread, key gate mode is not totally seamless... but for a workaround I'll sample chops 1,3,5, etc... on the white keys and go back and do the even numbers on the black keys. "Auto next" mode is surprisingly convenient and accurate but I don't think it can be done in resample mode. You can also set any sampling mode to start recording by sample button, note-on or desired threshold (sensitivity 1-10).
NOW FOR MY (FEW) COMPLAINTS.......
It is VERY easy to overwrite samples accidentally. Unlike the 404, the microsampler will allow you to overwrite any sample at any time without having to delete the previous one. This is a nice feature, saves time (Purging) but it is very easy to screw up. I find myself constantly saving, so that I can turn the microsampler off and on if I make a big mistake. Also, in pattern mode if you don't stop recording it will just wipe clean everything you did as it loops around again.
No attack settings for samples, so you will often get that beginning "click". hitting a key repeatedly will also give you this click sound (randomly

), similar to vinyl sim crackle. It is not always noticeable but I really don't like the way it pops at times i wouldn't expect. The Korg editor software can fix clicks at the beginning (via usb) with a "fade in" setting.... but why there is no attack setting on the machine itself is beyond me (decay and release are both included). I would have traded half of these FX for a setting to fix these clicks. It's not too much of a hassle to do this in the software (it's fast and transmits back and forth) but I don't like having to use a laptop.
@squil, hopefully I'll come up with something soon! I'm still just messing around with it. Also, let me know if you are experiencing these annoying clicking sounds.